Per emil perman



P. E. PERMAN.

SELF CALCULATING BALANCE.

APPLICATION HLED JAN. 16. I915. RENEWED APR. 5.1919.

Patented Nov. 18, 1919.

UNITED smi es PATENT OFFICE;

' PER EMIL PERMAN, 0F STOCKHOLM, SWEDEN, ASSIGNOR OF ONE-HALF TO HUGbTEODOR TIL LQUIST, OF STOCKHOLM, SWEDEN.

SELF-CALCULATING BALANCE.

Specification of Letters Patent.

Patented Nov. 18, 1919.

Application filed January 16, .1915, Serial No. 2,803. Renewed April 5,1919. Serial No. 287,928.

To all whom it may concern Be it known that I, Pun EMIL PERMAN, asubject ofthe King of Sweden, and resident of Sturegatan 50, Stockholm,Sweden, have invented certainnew and useful Improvements inSelf-Calculati Balances, of which the following is a speci cation.

The idea on which the present invention is founded can most suitablybe-applled on a spring or a pendulum balance or on any balance wlth amovable organ, whose position states the weight. The object of the invention is to construct an apparatus with which the price of the weighedarticle on the basis of a certain price per unit can be read. old. It istherefore obvious that the balance must be provided with a multiplier.Such an apparatus which can be modified in view oi the said purposeexists already in the socalled calculating stick, which is founded onthe known log ab.

A practical constructional form of the invention is illustrated part1diagrammatically on the accompanying rawing.

P is the pivotal point of a link of a balance (not otherwiseillustrated) and has different ositio'ns for different weights placed onthe balance. The movement of this linkpoint is transferred to thepointer 1 insuch a manner that the turning angle of the pointer on theaxis 2 in every case constitutes a graphical measure of the logarithm ofthe number, which in a certain unit of weight states the value of theweight on the balance.

This can for instance-be carried out in the manner shown wherein a verythin spring, cord or the like 3 from the link-point P is wound upon ahelical plate 4 whose outline is calculated in such a manner, that theangle of the unwinding corresponds to the logarithm of the number whichstates the value of the weight. A counter-weight 5 with its cord 6operates to restore the parts. This detail can be constructed in manyother ways.

The multiplier comprises further a rotatable ring 7 provided with alogarithmical graduation, corresponding to the said movement of thepointer, but with the numbers corresponding to the logarithms.

It is further suitable but not necessary to have a fixed scale 8 withthe same logarithmical angle graduation as the movable ring 7proposition that log a log 6 and also with the numbers corresponding tothe logarithms. The movable scale 7 may be mounted with its inner edgearound the fixed scale 8, the rotation of the ring 7 being facilitatedby handles 9.

The balance is used in the following manner: When the article to beweighed costs for instance $1.60 er kilogram, the ring-like scale 7 isset wit aid of the handles 9 so that the number 160 on the scalecorresponds with the zero position of at pointer. When the article islaced on the balance, the pointer l is de ected and the exact weight (onthe drawing 2.2 kg.) can then directly be read from the fixed scale 8.At the same time the pointer also indicates the cost $3.52 on themovable scale 7. a If the scale 7 were turned back to the zero positionit would indicate the weight so that the fixed scale is not necessarybut is very convenient. The size of the scales makes it possible forgradnation in cents; and when the graduatlon is made helical instead ofcircular, through deviation angles greaterthan 360 is possible. While Ihave described my invention as especially applicable for the computinValues in connection with balances, it IS to be understood that it isgenerally applicable for indicating values where the value depends uponthe product of a quantity representing a unit of price registers withzero said pointer will indicate on the scale the product of the quantityand the unit of price.

2. In a computing-scale for measuring instruments, a pointer, a scaleover which said pointer is adapted to move, means for moving said scale,a fixed scale concentrio with and adjacent to the movable scale andcodperating with said pointer to indicate quantity, means adapted forconnection to a balance for moving the pointer through an angulardistance corresponding to the logarithm of the quantity measured, and afixed zero-position indicator, said movable scale being graduated inunits such that when any graduation mark representing. a unit of priceregisters with zero said pointer will indicate on the scale the prod uctof the quantity and the unit of price.

3. In a computing-scale for measuring instruments, a pivoted ointer, a.scale over which said pointer is aapted to move, means for moving saidscale, a rotatable helical logarithmic plate upon which said pointer iscarried, means connecting the measuring instrument and said plate tomove the latter and therefore the pointer through an an I- lar distancecorresponding to the logarit m of the quantity measured, and a fixedzeroposition indicator, said movable scale being graduated in units suchthat when any graduation mark representing a unit of price registerswith zero said pointer will indicate on the scale the product of thequantity and the unit of price.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

PER EMIL PERMAN.

Witnesses:

JOHN MARKMAN, HILDNE THORLING.

